Reto #45 - Java

Retos/Reto #45 - EL CALENDARIO DE ADEVIENTO 2023 [Fácil]/java/Qv1ko.java

@@ -0,0 +1,123 @@
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.ArrayList;
+
+class Qv1ko {
+
+    public static void main(String[] args) {
+        calendar();
+    }
+
+    private static void calendar() {
+
+        ArrayList<String> participants = new ArrayList<String>();
+        String participant = "";
+        int position = 0;
+        boolean on = true, exit = false;
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+
+        while (!exit) {
+
+            System.out.print("\n1) Add participant | 2) Show participants | 3) Delete participant | 4) Carry out the draw | 5) Exit\nSelect one option: ");
+
+            try {
+                switch(br.readLine()) {
+
+                    case "1":
+
+                        System.out.println("\nAdd participant\n");
+
+                        System.out.print("Name: ");
+                        participant = br.readLine();
+
+                        for (String p : participants) {
+                            if (participant.equalsIgnoreCase(p)) {
+                                System.out.println("\nThe participant already exists\n");
+                                on = false;
+                                break;
+                            }
+                        }
+
+                        if (on) {
+                            participants.add(participant);
+                        }
+
+                        break;
+
+                    case "2":
+
+                        System.out.println("\nList of participants\n");
+
+                        for (int i = 0; i < participants.size(); i++) {
+                            System.out.println("- " + participants.get(i));
+                        }
+
+                        break;
+
+                    case "3":
+
+                        if (participants.size() > 0) {
+
+                            System.out.println("\nDelete participant\n");
+
+                            System.out.print("Name: ");
+                            participant = br.readLine();
+
+                            for (int i = 0; i < participants.size(); i++) {
+                                if (participant.equalsIgnoreCase(participants.get(i))) {
+                                    participants.remove(i);
+                                    on = false;
+                                    break;
+                                }
+                            }
+
+                            if (on) {
+                                System.out.println("\nParticipant does not exist");
+                            } else {
+                                System.out.println("\nThe participant has been eliminated");
+                            }
+
+                        } else {
+                            System.out.println("\nNo participants");
+                        }
+
+                        break;
+
+                    case "4":
+
+                        if (participants.size() > 0) {
+
+                            position = (int)(Math.random() * participants.size());
+                            System.out.println("\nThe winner is " + participants.get(position));
+
+                            participants.remove(position);
+
+                        } else {
+                            System.out.println("\nNo participants");
+                        }
+
+                        break;
+
+                    case "5":
+
+                        System.out.println("\nLeaving...\n");
+                        exit = true;
+                        break;
+
+                    default:
+                        System.out.println("\nSelect a number");
+
+                }
+
+                on = true;
+
+            } catch (IOException exc) {
+                System.out.println("\nInput error\n");
+            }
+
+        }
+
+    }
+
+}